Separated at Birth was a police program you used in missing persons cases. You scanned a photo of the person you wanted, got back the names of half a dozen celebrities who looked vaguely like th subject, then went around asking people if they'd seen anybody lately who reminded them of A,B,C... The weird thing was, it worked better than just showing them a picture of the subject. The instructor at the Academy in Knoxville had told Rydell's class that that was because it tapped into the part of the brain that kept track of celebrities.

As far as I know, there is no existing example of this idea in use by police agencies. However, there is a site called MyHeritage Face Recognition that will allow you to upload a face and find out which celebrity you might resemble.

I tried it with a picture of Tommy Lee Jones - and the site correctly recognized the actor. I then picked at random a picture of Jesse James, the famous 19th century American outlaw. MyHeritage thinks that he closely resembles Alan Turing, the 20th century mathematician.